Steps to reproduce the problem:
1. WebView load a long  content by using loadDataWithBaseURL API.
2. I add a CSS rule to set multi column width and height to fit screen after I receive WebView onPageFinished callback.
3. Now it can be scrolled horizontally and look likes good.
4. I long touch the content and trigger Android selection and then use javascript to get the range like this:
var selection = window.getSelection();
var range = selection.getRangeAt(0);
var rects = range.getClientRects();

5. I got the wrong rect position when WebView scroll horizontally.

What is the expected behavior?
I reset the System WebView to version  37 ( 1602158-arm ) on Android 5.0 device.  The range.getClientRects is correct.  
If my screen width is 650 dp and it has 5 pages after  multi column.
The rect of each page should like this: 
page index 0: 0~650
page index 1: 650~1300
page index 2: 1300~1950
page index 3: 1950~2600
page index 4: 2600~3250

What went wrong?
Now I got the wrong rects like this:
The rect of each page should like this: 
page index 0: 0~650
page index 1: 650~1300
page index 2: 2400~3050
page index 3: 4550~5200
page index 4: 6250~6900

Did this work before? N/A 

Chrome version: 56.0.2924.87  Channel: stable
OS Version: android 5.0 and 6.0
Flash Version: